Macros : error: pasting does not give a valid preprocessing token

[girishk.k4]

Can someone tell me what is wrong here ?

#define LOG_MACRO(format,args...) printf(format,args)

#define TEST_MACRO(__arg1, __arg2, __format, args...) LOG_MACRO("ARG1: %s, ARG2 : %s" ## __format, ##args)

char* arg1 = "test";
char* arg2 = "test";
TEST_MACRO(arg1,arg2,"Testing Macro %s","foo");


error: pasting ""ARG1: %s, ARG2 : %s"" and ""Testing Macro %s"" does not give a valid preprocessing token